Conductive rod with high thermal stability integrated structure conductive slip ring and assembling method

Abstract

This application discloses a conductive rod with an integrated conductive slip ring featuring high thermal stability and its assembly method, relating to the field of assembly for weak signal transmission products in precision instruments. The conductive rod includes an enameled wire, a large journal, an insulating washer, a conductive slip ring, a small journal, a pure copper fixing fixture, and a nut. One end of the pure copper fixing fixture has a groove, through which the small journal extends from the bottom of the groove. The nut is connected to the end of the small journal to fix it to the pure copper fixing fixture. The enameled wire passes through the middle of the small journal. The conductive slip ring, insulating washer, and large journal are fitted around the enameled wire and located within the groove. The insulating washer is located on the side of the conductive slip ring away from the small journal, and the large journal is located on the side of the insulating washer away from the conductive slip ring. This invention solves the problems of large cumulative errors in the assembly process of conductive rods for precision instruments and the poor surface roughness and flatness of organic composite materials, thereby improving product quality and production efficiency.

Description

Technical Field

[0001] This invention relates to the assembly technology of a high-precision, high-dimensional stability, low-resistance irregular-shaped slip ring and conductive rod for mechanical rotary power transmission devices, belonging to the field of assembly technology for precision instrument weak signal transmission products. Background Technology

[0002] In the field of precision instruments and meters, especially mechanical instruments and meters, the inner loop signal output is amplified by the outer loop magnetic levitation control circuit. The key component connecting the inner and outer loops is the power transmission device, which is the core component for transmitting the inner loop signal to the outer loop without loss. The power transmission device is divided into a rotor and a stator. A qualified conductive rod, as the rotor of the mechanical contact power transmission device, has the following main functions: (1) to output the inner loop signal of the precision instrument and meter to the outer loop magnetic levitation control circuit without loss, ensuring the stability and reliability of the output signal of the instrument during long-term operation, and timely correcting the attitude by forming a control loop through the output signal; (2) to ensure the consistency of the conductive rod product during the assembly process, improve the dimensional stability of the product during use, reduce the assembly difficulty, greatly improve the assembly qualification rate, and play an important role in controlling the service life of the product.

[0003] The traditional method of assembling conductive rods is to use open-face laminated glass cloth organic composite material to isolate adjacent slip rings, and use organic glass material for assembly and fixing fixtures. This method increases the difficulty of part assembly and processing, which will lead to poor product consistency, reduced product reliability, dimensional stability and pass rate. The main manifestations are as follows: (1) The opening angle of the currently used laminated glass cloth is 60°. Due to the poor strength of the laminated glass cloth material itself, deformation will occur after the opening angle, resulting in poor flatness. Moreover, the machining process is difficult and the pass rate is low. The laminated glass cloth is an organic composite material with a large coefficient of thermal expansion. After assembly, the cumulative effect is high. (1) Large cumulative error, which can easily cause the conductive rod to crack during the temperature cycling process due to internal stress; (2) The slip ring used in the current product is easily deformed during the stacking and assembly process due to its structure. After deformation, the flatness becomes worse, resulting in a larger cumulative dimensional error. In the subsequent glue filling process, the thickness of the glue layer after mechanical processing is uneven, which affects the contact resistance of the conductive rod and signal transmission, and reduces the service life of the product; (3) The expansion coefficient of the plexiglass fixing tool is large and there is a large difference between it and the expansion coefficient of the laminated glass cloth and gold, silver and copper slip rings. During the temperature cycling process, the fixing tool and the assembled product will move relative to each other along the axial direction, which will cause internal stress or even cracking. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a conductive rod and assembly method for an integrated conductive slip ring with high thermal stability, which greatly improves the product assembly consistency and pass rate, simplifies the machining process, improves the machining efficiency of components, and reduces the difficulty of operation; and controls the coefficient of linear expansion to ensure the product dimensional stability and improve product accuracy.

[0005] The technical solution of this invention is:

[0006] The conductive rod of the integrated conductive slip ring with high thermal stability includes enameled wire, large journal, insulating gasket, conductive slip ring, small journal, pure copper fixing fixture, and nut.

[0007] A groove is provided at one end of the pure copper fixture. A small journal passes through the bottom of the groove and is attached to the end of the small journal to fix the small journal to the pure copper fixture.

[0008] The enameled wire passes through the middle of the small journal. The conductive slip ring, insulating gasket, and large journal are sleeved on the outside of the enameled wire and located in the groove. The insulating gasket is located on the side of the conductive slip ring away from the small journal, and the large journal is located on the side of the insulating gasket away from the conductive slip ring.

[0009] Multiple conductive slip rings and enameled wires are provided, with one enameled wire electrically connected to one conductive slip ring.

[0010] The conductive slip ring has a central hole along its own axis, and an annular groove and a slot are formed on one side of the conductive slip ring. The inner diameter of the annular groove is equal to the diameter of the central hole, and the slot connects the annular groove to the outer circumference of the conductive slip ring.

[0011] The conductive slip ring has an annular groove on one side facing the small journal.

[0012] Along the direction from the small journal (5) to the large journal (2), the next conductive slip ring (4) rotates by the same angle relative to the previous conductive slip ring (4) in the same direction, and the sum of the rotation angles of all conductive slip rings is 360°; along the direction from the small journal to the large journal, the next conductive slip ring rotates by (12±1)° relative to the previous conductive slip ring; the conductive slip ring is made of gold-silver-copper alloy.

[0013] The insulating pad has a sector-shaped groove coaxial with itself, and the sector-shaped groove extends through the insulating pad along the axial direction of the insulating pad.

[0014] The central angle of the sector groove is (60±1)°.

[0015] Two insulating pads are provided, and the included angle between the center lines of the sector grooves of the two insulating pads is (180±5)°.

[0016] The angle between the center line of the fan-shaped groove of the adjacent insulating pad and the center line of the slot of the conductive slip ring is 90°.

[0017] The assembly method of the conductive rod of the integrated conductive slip ring with high thermal stability includes:

[0018] S1: Pass the insulating small journal through the bottom of the groove through the pure copper fixing fixture, and thread the nut to the end of the small journal that passes through the pure copper fixing fixture.

[0019] S2: Pass the enameled wire through the small shaft journal, and stack the conductive slip rings into the pure copper fixing fixture in sequence. The latter conductive slip ring is rotated (12±1)° clockwise relative to the former conductive slip ring, so that the enameled wire passes through the center hole of the conductive slip ring and connects with the conductive slip ring.

[0020] S3: Assemble two insulating pads onto one end of the small journal of the conductive slip ring. The included angle between the center lines of the fan-shaped grooves of the two insulating pads is (180±5)°, and the angle between the center line of the fan-shaped groove of the adjacent insulating pads and the center line of the slot of the conductive slip ring is (90±2)°.

[0021] S4: The end lead of the conductive slip ring passes through the waist-shaped hole of the large journal, and the large journal is assembled along the axis of the small journal until it contacts the insulating gasket. A certain pressure is applied so that the conductive slip ring and the insulating gasket will not move radially or axially. The large journal is fixed to the pure copper fixture with glue to obtain the assembled slip ring.

[0022] S5: After curing the assembled slip ring, perform temperature cycling to remove internal stress, and then place it in the glue injection fixture for glue injection;

[0023] S6: Inject glue into the glue injection fixture and cure it to obtain the cured assembly slip ring. Mill the outer circumference of the cured assembly slip ring with the axis of the pure copper fixing fixture as the axis until the outer diameter of the annular groove of the conductive slip ring is reached to obtain the conductive rod.

[0024] In step S6, when the assembly slip ring is located inside the glue injection fixture, the large journal end is located at the bottom.

[0025] In summary, this application includes at least the following beneficial technical effects:

[0026] (1) This invention proposes a high-precision, high-dimensional stability, low-resistance integrated conductive slip ring and assembly technology for mechanical rotary power transmission devices. It can be used for weak signal transmission devices of precision instruments or meters with high requirements for dimensional stability and conductivity. It solves the problems of large cumulative error in the assembly process of conductive rods of precision instruments and meters and poor surface roughness and flatness of organic composite materials. By redesigning the structure, it achieves the purpose of improving product quality and production efficiency.

[0027] (2) By redesigning the structure of the core component slip ring, the present invention integrates the organic composite material gasket and slip ring into an integral irregular structure and uses gold, silver and copper materials, which reduces the problem of large linear expansion coefficient after assembly and greatly improves product reliability.

[0028] (3) By redesigning the material of the fixture, the present invention replaces the organic glass with a large coefficient of expansion with pure copper, ensuring that the coefficient of expansion of the pure copper fixture is closer to that of the gold, silver and copper wire, ensuring that no relative movement will occur during the product manufacturing process, which will lead to internal stress or cracks, thereby ensuring product quality.

[0029] (4) This invention can be applied to aerospace, precision instruments and meters and other fields, and provides an effective product structure and method for assembling conductive rods for mechanical rotary high-precision, high-dimensional stability and low-resistance power transmission devices, reducing production difficulty, improving product reliability, consistency and pass rate, and ensuring product quality. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an assembly method for an integrated conductive slip ring with high thermal stability, according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the integrated irregular-shaped conductive slip ring structure in an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached diagram: 1. Enamelled wire; 2. Large journal; 3. Insulating gasket; 4. Conductive slip ring; 5. Small journal; 6. Pure copper fixing fixture; 7. Nut. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] This application discloses a conductive rod and assembly method for an integrated conductive slip ring 4 with high thermal stability, such as... Figure 1 As shown, the conductive rod of the integrated conductive slip ring 4 with high thermal stability includes an enameled wire 1, a large journal 2, an insulating gasket 3, an integrated conductive slip ring 4, a small journal 5, a pure copper fixing fixture 6, and a nut 7. In this embodiment, the insulating gasket 3 is made of laminated glass cloth.

[0035] Before use, the small journal 5 needs to be insulated. The working area of ​​the small journal 5 is potted with insulating glue and then machined to make the outer diameter cross section of each part of the surface uniform and consistent with the technical specifications, and to obtain a uniform roughness on the outer surface. The integrated conductive slip ring 4 needs to be welded to the enameled wire 1 before use. The enameled wire 1 extends in the direction of the plane of the integrated conductive slip ring 4.

[0036] The central axes of the large journal 2, the laminated glass cloth insulating gasket 3, the integrated conductive slip ring 4, the small journal 5, and the pure copper fixing fixture 6 are on a straight line. The small journal 5 is fixed to the pure copper fixing fixture 6 by a nut 7. The integrated conductive slip ring 4 and the pure copper fixing fixture 6 are clearance fit.

[0037] The small journal 5 and the large flange end pass through the pure copper fixing fixture 6 until the outer surface of the flange contacts the inner surface of the pure copper fixing fixture 6; the nut 7 is fitted with the small journal 5 and tightened until the small journal 5 does not produce axial or radial wobble; after the integrated conductive slip ring 4 and the enameled wire 1 are welded together, the welded assembly is inserted into the pure copper fixing fixture 6 through the central inner hole along the small journal 5, and assembled according to the power transmission device path requirements; after the integrated conductive slip ring 4 is assembled, two laminated glass cloth insulating gaskets 3 are installed at the end assembly position; the lead-out ends of the enameled wire 1 are led out from the waist holes on the large journal 2 in odd and even order, and the large journal 2 is assembled along the axial direction to the bottom and fixed with ethyl α-cyanoacrylate.

[0038] Reference Figure 2 The integrated irregular-shaped conductive slip ring 4 is a single unit that integrates the laminated glass cloth board and the conventional slip ring structure. It is constructed entirely of gold, silver, and copper materials. Based on this integrated design, a 60° fan-shaped area is machined on one side of the slip ring. Before use, the required length of enameled wire 1 with an insulating layer is de-enamelted. The oxide layer generated during the de-enamelting process is removed through ultra-precision grinding. The enameled wire 1 is then soldered to the edge of the inner hole of the irregular-shaped slip ring using solder. The extension direction of the enameled wire 1 is the non-grooved side of the irregular-shaped slip ring.

[0039] This embodiment also discloses an assembly method for a conductive rod with a high thermal stability integrated conductive slip ring 4, including the following steps:

[0040] S1: The small journal 5, after being insulated, passes through the pure copper fixing fixture 6 and is locked in place by the nut 7.

[0041] S2: Stack the integrated structure conductive slip ring 4 with the slotted side facing inward according to the required quantity of technical specifications. The last conductive slip ring 4 is rotated 12° clockwise relative to the previous conductive slip ring 4 group. The enameled wire 1 is passed through the small shaft journal 5 and the conductive slip ring 4 to ensure that the enameled wire 1 is neatly arranged in the center hole of the conductive slip ring 4 and does not tangle with each other. The slots are evenly distributed along the outer circle of the integrated structure conductive slip ring 4.

[0042] S3: After the integrated structure conductive slip ring 4 is assembled, two insulating pads 3 made of laminated glass cloth are assembled at the end. The insulating pads 3 are sleeved on the outside of the enameled wire 1. The two insulating pads 3 are 180° apart. The angle between the slot of the last conductive slip ring 4 and the fan-shaped slot of the adjacent insulating pad 3 is 90°.

[0043] S4: Pass the end lead of the integrated conductive slip ring 4 through the two oblong holes of the large journal 2, and assemble the large journal 2 along the axis of the small journal 5 until it contacts the insulating pad 3. Apply a certain pressure until the integrated conductive slip ring 4 and the laminated glass cloth insulating pad 3 do not move radially or axially. Fix the large journal 2 to the pure copper fixing fixture 6 with glue (in this embodiment, the glue is ethyl α-cyanoacrylate) to obtain the assembled slip ring.

[0044] S5: After assembly, the assembly slip ring is cured and subjected to a low-temperature-high-temperature cycle to remove internal stress. Then it can be placed into a special dispensing fixture for subsequent processes such as dispensing.

[0045] S6: Place the cured assembly slip ring into the glue injection fixture, with the large journal 2 at the bottom, and inject glue into the glue injection fixture. The setting, quantity setting, and position setting of the fan-shaped groove of the insulating gasket 3 solves the problem of uneven glue injection at the end of the large journal 2 due to the fluidity of the glue when it flows to the bottom, ensuring the uniformity of glue injection at the end of the large journal 2.

[0046] After the glue is injected and cured, the cured assembly slip ring is obtained. The outer circumference of the cured assembly slip ring is milled with the axis of the pure copper fixing fixture 6 as the axis until the outer diameter of the annular groove of the conductive slip ring 4 is reached, thus obtaining the conductive rod.

[0047] The principle of this invention is as follows:

[0048] The conductive slip ring 4, a core component of the conductive rod, is designed as an integrated irregular structure. By changing the structure to an integrated one, the difficulty of assembling and processing parts is reduced, as is the difficulty of operation and the cumulative error. By changing the material of the conductive slip ring 4 and cooperating with the material of the pure copper fixing fixture 6, the coefficient of linear expansion is reduced, thereby improving product quality and reliability.

[0049] During assembly, the integrated conductive slip ring 4 is sequentially fitted with copper fixing fixtures. Each subsequent conductive slip ring 4 is rotated 12° clockwise relative to the previous one. This special assembly method fully utilizes the narrow space within the inner hole of the integrated conductive slip ring 4, preventing the enameled wires 1 from tangling and deforming, thus avoiding stress and ensuring product quality. Simultaneously, through reasonable process control, the 60° grooves on the outer surface of the integrated conductive slip ring 4 are evenly distributed, ensuring sufficient flow of adhesive in the subsequent potting process and improving product quality and reliability.

[0050] This embodiment proposes a high-precision, high-dimensional stability, low-resistance integrated conductive slip ring 4 and its assembly technology for mechanical rotary power transmission devices. It can be used in weak signal transmission devices for precision instruments or meters with high requirements for dimensional stability and conductivity. It solves the problems of large cumulative errors in the assembly process of conductive rods for precision instruments and meters, as well as poor surface roughness and flatness of organic composite materials. The organic composite material gasket and slip ring are designed as an integrated irregular structure, and all materials are gold, silver, and copper. By redesigning the structure, the aim is to improve product quality and production efficiency. The organic glass with a large coefficient of thermal expansion is replaced with pure copper, ensuring that the linear expansion coefficient of the pure copper fixing fixture 6 is closer to that of gold, silver, and copper. This ensures that relative movement during product manufacturing will not cause internal stress or cracks, thus guaranteeing product quality, reducing the problem of a large coefficient of thermal expansion after assembly, and greatly improving product reliability.

[0051] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A conductive rod with an integrated conductive slip ring featuring high thermal stability, characterized in that: Includes enameled wire (1), large journal (2), insulating gasket (3), conductive slip ring (4), small journal (5), pure copper fixing fixture (6), and nut (7). A groove is provided at one end of the pure copper fixing fixture (6), and the small journal (5) passes through the bottom of the groove and the pure copper fixing fixture (6). The nut (7) is connected to the end of the small journal (5) to fix the small journal (5) to the pure copper fixing fixture (6). The enameled wire (1) passes through the middle of the small journal (5). The conductive slip ring (4), the insulating pad (3) and the large journal (2) are sequentially sleeved on the outside of the enameled wire (1) and located in the groove. The insulating pad (3) is located on the side of the conductive slip ring (4) away from the small journal (5), and the large journal (2) is located on the side of the insulating pad (3) away from the conductive slip ring (4). Multiple conductive slip rings (4) and enameled wires (1) are provided, and one enameled wire (1) is electrically connected to one conductive slip ring (4); The conductive slip ring (4) has a central hole along its own axis. An annular groove and a slot are provided on one side of the conductive slip ring (4). The inner diameter of the annular groove is equal to the diameter of the central hole. The slot connects the annular groove to the outer circumference of the conductive slip ring (4). Along the direction from the small journal (5) to the large journal (2), the next conductive slip ring (4) rotates by the same angle in the same direction as the previous conductive slip ring (4), and the sum of the rotation angles of all conductive slip rings is 360°; the conductive slip ring (4) is made of gold-silver-copper alloy; The insulating pad (3) has a sector-shaped groove coaxial with itself, and the sector-shaped groove penetrates the insulating pad (3) along the axial direction of the insulating pad (3); Two insulating pads (3) are provided, and the angle between the center lines of the fan-shaped grooves of the two insulating pads (3) is (180±5)°.

2. The conductive rod of the integrated conductive slip ring with high thermal stability according to claim 1, characterized in that: The conductive slip ring (4) has an annular groove on one side facing the small journal (5).

3. The conductive rod of the integrated conductive slip ring with high thermal stability according to claim 2, characterized in that: Along the direction from the small journal (5) to the large journal (2), the latter conductive slip ring (4) rotates (12±2)° relative to the former conductive slip ring (4).

4. The conductive rod of the integrated conductive slip ring with high thermal stability according to claim 3, characterized in that: The central angle of the sector groove is (60±1)°.

5. The conductive rod of the integrated conductive slip ring with high thermal stability according to claim 4, characterized in that: The angle between the center line of the fan-shaped groove of the adjacent insulating pad (3) and the center line of the slot of the conductive slip ring (4) is (90±2)°.

6. The assembly method of the conductive rod of the integrated conductive slip ring with high thermal stability as described in any one of claims 1 to 5, characterized in that: include S1: Pass the insulating small journal (5) through the pure copper fixing fixture (6) from the bottom of the groove, and thread the nut (7) to one end of the small journal (5) that passes through the pure copper fixing fixture (6). S2: Pass the enameled wire (1) through the small shaft journal (5), and stack the conductive slip rings (4) in sequence into the pure copper fixing fixture (6). The latter conductive slip ring (4) is rotated 12° clockwise relative to the former conductive slip ring (4) so ​​that the enameled wire (1) passes through the center hole of the conductive slip ring (4) and connects with the conductive slip ring (4). S3: Assemble two insulating pads (3) to the end of the conductive slip ring (4) away from the small journal (5). The included angle between the center lines of the fan-shaped grooves of the two insulating pads (3) is (180±5)°, and the angle between the center line of the fan-shaped groove of the adjacent insulating pads (3) and the center line of the slot of the conductive slip ring (4) is (90±2)°. S4: The end lead of the conductive slip ring (4) passes through the waist-shaped hole of the large journal (2), and the large journal (2) is assembled along the axis of the small journal (5) until it contacts the insulating pad (3). A certain pressure is applied so that the conductive slip ring (4) and the insulating pad (3) do not move radially or axially. The large journal (2) is fixed to the pure copper fixing fixture (6) with glue to obtain the assembled slip ring. S5: After curing the assembled slip ring, perform temperature cycling to remove internal stress, and then place it in the glue injection fixture for glue injection; S6: Inject glue into the glue injection fixture and cure it to obtain the cured assembly slip ring. Mill the outer circumference of the cured assembly slip ring with the axis of the pure copper fixing fixture (6) as the axis until the outer diameter of the annular groove of the conductive slip ring (4) is milled to obtain the conductive rod. In S6, when the assembly slip ring is located in the glue injection fixture, the large journal (2) end is located at the bottom.

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